Liquid cooled grinder wheel



May 15, 1956 s. G. BRADY LIQUID COOLED GRINDER WHEEL Filed Jan. 24, 1955INVENTOR.

SAMUEL G. BRADY ATTOR NEYS suitable construction.

United States Patent LIQUID COOLED GRINDER WHEEL Samuel G. Brady, RoyalOak, Micl1., assiguor to The Gear Grinding Machine Company, Detroit,Mich., a corporation of Delaware Application January 24, 1955, SerialNo. 483,697

2 Claims. (Cl. 51--267) The invention relates to grinder wheels of thattype in which a coolant liquid is fed through the pores of the wheelbody to the peripheral grinding surface thereof. Heretofore grinderwheels of this character have been made in which the coolant liquid,such as Water, is fed to the wheel radially outward from its attachmentto the rotary spindle. The water entering the pores of the structure atsuch point will be fed outward by centrifugal action which is reliedupon to discharge it on the grinding surface. However, there is no forceother than capillarity for causing the water to enter into the body andconsequently the amount that is fed to the grinding surface may beinadequate to produce suflicient cooling.

It is the object of my invention to obtain a construction in which agreatly increased volume of liquid is introduced into the body of thegrinder wheel and under pressure which supplements centrifugal force infeeding it outward to the grinding surface. To this end the inventionconsists in the construction as hereinafter set forth.

In the accompanying drawings:

Fig. 1 is an axial cross section through the grinder wheel and itsspindle to which my improved means for introducing the coolant Water isattached.

Fig. 2 is a cross section on line 2-2, Fig. 1.

The grinder wheel A is of a character which, as above stated, issufliciently porous to receive within its body the coolant liquid. Thiswheel is mounted upon a spindle B and is secured thereto by clampingplates C and C, a nut D having a threaded engagement with a portion ofthe spindle, the parts as thus far described being of any T o introducethe coolant liquid into the body of the wheel I form the spindle with acentral chamber E therein which is connected by radially extending portsF with a helical groove G in the portion of its outer surface which isengaged by the wheel A. The clamping plates 0 and C' are recessed at C,C to 2,745,229 Patented May 15, 1956 ice therefrom other than throughsaid porous wheel by seal-' ing rings H and H, the former between thechambers and the periphery of the plates and the latter between saidplates and the spindle. there is attached by screw threaded engagementtherewith a hollow extension member I. This is surrounded by anon-revoluble member I with ball bearings K and K therebetween. of anyliquid therebetween. The outer end portion of the member I has a chamberJ therein which is in communication with the hollow member I. A conduitM connected to the member I and in communication with the chamber Jtherein willsupply water or other coolant liquid at any desired pressureto the chamber E. From this chamber it passes through the radialchannels F to the helical groove G from which it will pass in oppositedirections to the'chambers-C and C These overlap portions of the sidesurface of the wheel and the helical groove is adjacent to the surfaceof the wheel contacting with the spindle. Thus, the pressure will forceliquid into the body of the wheel at a relatively high rate sulficientto insure proper cooling of the grinding surface.

What I claim as my invention is:

l. A liquid cooled grinding wheel comprising a grinder body sufficientlyporous for passage of liquid therethrough, a hollow rotary spindle onwhich said'body is mounted having a helical channel in the portion ofits surface surroundedby said body with radial ports connecting thespace within the spindle and said channel, clamping plates on oppositesides of said body dished to form chambers in communication with saidchannel, sealing means between said body and plates at the periphery ofsaid chambers and also between said plates and spindle and a connectionat the outer end of said spindle for the introduction of cooling liquidunder pressure.

2. A construction as in claim 1 in which said connection includes asmall diameter tubular extension of said rotary spindle, a non-rotatingsleeve surrounding said extension connected to the source of fluid underpressure, an antifriction bearing between said extension and sleeve, andsealing means for preventing leakage of fluid through said bearing.

I Stolzenberg Aug. 8, 1905 Murphy Juliy 25, 1939 At the outer end of thespindle Packing'material L will prevent passage

